GlassBottleOutlet has by far the cheapest prices on any of the colored Glass Boston Round Bottles. For example, I ordered their Amber Glass Boston Round bottles, all with the polycone caps, and got:
2oz. (60mL) for $.41 each
4oz. (120mL) for $.48 each
8oz. (240mL) for $1.18 each
Before buying them...I'd compared the other top places recommended, and GBO beat them price-wise by a bunch! Several of the other places also had way higher S/H costs, too...was nearly what the bottles themselves cost, and in 1 case...it was
more than the bottles!
Edit: Also, something to remember is that you
don't need a whole bunch of the smaller sized bottles, since they're only used when you "break down" 1 of whatever your largest size bottle is. For example, I got (4) 8oz. (240mL) bottles to break down each liter I bought. Those held 960mLs of each liter.
I left the extra 40mLs in the container at that time, and recapped it.
I split up all my liters like that first...filling just the 8oz. (240mL) bottles. When I was finished with those, I capped them, labeled each bottle, wrapped them individually in bubblewrap, and then they went into an outer Priority Mail cube-shaped 6 x 6 x 6" box (it holds 9 of the 8oz. bottles very nicely, by the way). When all those were sealed up and the outer box was labeled and put in the freezer...then I dealt with the remaining 40mLs that were left in each liter bottle it came in. Since I only bought 4 liter bottles of Nic base...I combined those extra 40mLs into (3) 2oz. (60mL) bottles, capped them & labeled them, and they went into yet another small, Flat Rate, recycled PM box. Taped and labeled it, and into the freezer it went! I'll use up the Nic base in
those smaller bottles first (removing just 1 at a time from the freezer to use as my "working" bottle), and then I can
reuse them each time I need to break down 1 of the 8oz. (240mL) larger bottles in the future. I just needed to
add 1 more 2oz. bottle to those 3, so I'd have enough to break down a 240mLs bottle later.
Doing it that way, it really cut down on the total number of bottles I needed to buy. In your case, you'd need (4) 8oz. (240mLs) bottles
for each liter you bought. I'd then combine all the little 40mLs left in your 16 liter bottles (which would be 640mLs)... into (2) more of the (240mLs) 8oz. bottles.
Those 2 will hold 480mLs of that 640mLs. Put the remaining 160mLs into (3) 2oz. (60mL) bottles. Put 2 of those into your freezer. Leave
the one that's not quite full out of the freezer...to use as your working bottle when making some eliquids.
So, here's what you'd need if you did the above:
(64) 8oz. (240mL) bottles w/polycone caps (holds
most of the 16 liters)
(2) 8oz. (240mL) bottles w/polycone caps (holds 480mLs of the extra 640mL)
(4) 2oz. (60mL) bottles w/polycone caps (holds the remaining 160mLs) + the 1 more needed when breaking down a 240mL bottle later.
Extras recommended in case of breakage later:
(2) more of the 8oz. above
(2) more of the 2oz. above
TOTAL Bottles you'd need that way, with extras:
(68) 8oz. Amber Glass Boston Round with Polycone Caps
$48.14 - Sold by the tray of 48 at a discount @ $1.002 each
$23.60 - For 20 singles of the same bottles @ $1.18 each
https://www.glassbottleoutlet.com/product/8-oz-amber-boston-round-with-black-poly-cone-cap-28400
(6) 2oz. Amber Glass Boston Round with Polycone Caps
$2.46 - Sold as singles @ $.41 each
https://www.glassbottleoutlet.com/product/2-oz-amber-boston-round-with-black-poly-cone-cap-20400
$74.20 Total (not including shipping)
*************************************
OR, you could use these instead, breaking down each liter into larger 16oz. Amber Glass Boston Round Bottles with Polycone Caps, and using a few more 2oz. bottles each time you break a 16oz. bottle down. Even including a couple extras of each size...it would
save you even more $$:
(36) 16oz. Amber Glass Boston Round Bottles with Polycone Caps
$46.98 - Sold by the case of 12 @ $15.66/case. Order 3 cases
https://www.glassbottleoutlet.com/product/16-oz-amber-boston-round-with-black-poly-cone-cap-28400
(10) 2oz. Amber Glass Boston Round Bottles with Polycone Caps
$4.10
https://www.glassbottleoutlet.com/product/2-oz-amber-boston-round-with-black-poly-cone-cap-20400
$51.08 Total (not including shipping)